[BUGFIX] Let FormEngine Slider wizard save data again

Due to a change in FormEngine slider rewrite, the parameters
do not get handed over to the TBE_EDITOR update signal,
thus any changes on the slider do not reflect the actual field
that is sent to the server again.

Using apply() correctly as well as a document.ready()
statement makes this functionality work again.

Resolves: #71977
Releases: master
Change-Id: Ib033015d0c3869da487e9163ceca303bd1b436c8
Reviewed-on: https://review.typo3.org/45145


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>

typo3/sysext/backend/Resources/Public/JavaScript/ValueSlider.js

@@ -59,7 +59,7 @@ define(['jquery', 'twbs/bootstrap-slider'], function($) {
 				break;
 		}
 
-		TBE_EDITOR.fieldChanged.apply(sliderCallbackParams);
+		TBE_EDITOR.fieldChanged.apply(TBE_EDITOR, sliderCallbackParams);
 	};
 
 	/**
@@ -88,7 +88,7 @@ define(['jquery', 'twbs/bootstrap-slider'], function($) {
 	};
 
 	// init if document is ready
-	$(function() {
+	$(document).ready(function() {
 		ValueSlider.initializeSlider();
 	});